is a SAMPLE playing?

is a SAMPLE playing?

Mark Oates

Member #1,146

March 2001

I like having self-contained code, so I'm trying to figure out a way to prevent a sample from playing if it's already playing.

The way the code works, if the player is inside a "hint zone" then the sample plays looped. I want to avoid triggering the sample once, instead using a function like this:

int play_sound(SAMPLE *s, bool looped=false)
{
     if (!s) return 0;
     else if (****SAMPLE_IS_NOT_PLAYING****)
     {
         play_sample(s, 255, 128, 1000, looped);
     }
     return 1;
}

I searched the forums and found info about voice allocation. it seemed complicated and required external variables. Is there a simple way to do this?

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Billybob

Member #3,136

January 2003

There's a way to do it, but from my research you're going to need that external variable.
It might be best to wrap SAMPLE into a class CSample or something.

Anyway you need to store the voice returned by play_sample. Then run voice_check on that value and see if it == the SAMPLE. If it does, the sample is playing.

EDIT: I can't find a place where SAMPLE::param is used. Does Allegro ever use it? If not you can store the voice in there, that way you won't have to make a CSample or something to contain it.
sample->param = (void *)the_voice;

will only work if sizeof(void *) == sizeof(int)

Thomas Fjellstrom

Member #476

June 2000

or instead of wrapping SAMPLE, just wrap a voice.. thats all play_sample does. This way you get greater controll over your sounds.

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Mark Oates

Member #1,146

March 2001

It works, but it's ghetto:

1class sample_wrap_class
2{
3private:
   vector<SAMPLE *> sample;
   vector<int> voice;
6 
7public:
8 
   void add_pair(SAMPLE *s, int v)
   {
        sample.push_back(s);
        voice.push_back(v);
   }
   
   bool is_playing(SAMPLE *s)
   {
       for (int i=0; i<voice.size(); i++)
       {
           if (sample<i> == s) return voice_check(voice<i>);
       }
       return false;
   }
   
   void remove_reference(SAMPLE *s)
   {
       for (int i=0; i<voice.size(); i++)
       {
           if (sample<i> == s)
           {
               sample.erase(sample.begin() + i);
               voice.erase(voice.begin() + i);
           }
       }
   }
   
   void update()
   {
       for (int i=0; i<voice.size(); i++)
       {
           if (!voice_check(voice<i>))
           {
               sample.erase(sample.begin() + i);
               voice.erase(voice.begin() + i);
           }
       }
   }
47 
48};
49 
50sample_wrap_class sample_wrap;
51 
52 
53int play_sound(SAMPLE *s, bool looped=false)
54{
   if (!s)
   {
        //allegro_message("error");   
        return 0;
   }
   else
   {
       if (!sample_wrap.is_playing(s))
       {
          int v = play_sample(s, 255, 128, 1000, looped);
          sample_wrap.add_pair(s, v);
       }
   }
68}
69 
70int stop_sound(SAMPLE *s)
71{
   if (!s) return 0;
   else stop_sample(s);
74}

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Billybob

Member #3,136

January 2003

Better than nothin'.

Neil Walker

Member #210

April 2000

[edit]Ignore this, I spewed out a whole set of code for using the voice functions and managing them via timers, etc without realising that wasn't the question. So I've deleted it.

Neil.
MAME Cabinet Blog / AXL LIBRARY (a games framework) / AXL Documentation and Tutorial

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Mark Oates

Member #1,146

March 2001

Neil: What was the code all about? I'm interested.

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Neil Walker

Member #210

April 2000

You'll have to fill in the gaps yourself and ignore the class prefix, but...
you'll need these and set your own nice values
#define TIMER_DIGIPURGETIME 5000
#define MAXSOUNDS 32
int VoiceArray[MAXSOUNDS]; //maximum allowed voices

and maybe this somewhere:

install_int(TimerDigiPurgeNow,TIMER_DIGIPURGETIME);
void TimerDigiPurgeNow()
{
  //music handler for purging stuff
  //automatically deallocates sounds that have stopped playing
  //called every 5 seconds, which seems reasonable to me
  TimerDigiPurge=true;
}
END_OF_FUNCTION(TimerDigiPurgeNow);

Then in your timer looper say,
if(TimerDigiPurge) { SoundPurgeDigi(false); TimerDigiPurge=false;}

1int Framework::SoundPlayDigi(DATAFILE* df, int samplenum,int loopflag,int vol)
2{
if(vol==0) return -1;
else
{
  return SoundPlayDigi((SAMPLE*)df[samplenum].dat,vol,loopflag);
}
8}
9 
10int Framework::SoundPlayDigi(SAMPLE* samp, int vol, int loopflag)
11{
int ret=-1; //default which is could not play
13 
if(vol==-1) vol=GameConfiguration->CapsSound.SampleVolume;
if(vol>255 || vol<0) vol=255;

if(GameConfiguration->CapsActualSystem.UseSound && vol!=0) 
{
19 
  //allocate a voice if possible
  ret=allocate_voice(samp);
  if(ret!=-1) 
  {
    //if available add to list and play - see purgedigi/stopdigi
    //may fail to add if system removes a lower priority voice
    //until the purgedigi is called
    //hopefully
    //set sample priority
    voice_set_playmode(ret,loopflag);
    voice_set_volume(ret, vol);
    voice_start(ret);
32 
    //go through the voice array and deallocate voice if being stored
    for(int i=0;i<GameConfiguration->CapsSound.MaxSounds;i++) 
    {
      if(VoiceArray<i>==-1) 
      {
        VoiceArray<i>=ret;
        break;
      }
    }
  }
}
return ret;
45}
46 
47void Framework::SoundStopDigi(int voice,bool force)
48{
//stop a digi playing, for example if in a loop
if(voice<0 && GameConfiguration->CapsActualSystem.UseSound) 
{
  if(force==true) deallocate_voice(voice);  
  else release_voice(voice); //allow it to finish first
54 
  //go through the voice array and deallocate voice if being stored
  for(int i=0;i<GameConfiguration->CapsSound.MaxSounds;i++) 
  {
    if(VoiceArray<i>==voice) 
    {
      VoiceArray<i>=-1;
      break;
    }
  }
}
65}
66 
67void Framework::SoundPurgeDigi(bool killit)
68{
//go through the voice array and deallocate voices
//this is used to stop the user from having to do stopdigi
// to speed up call it on a timer rather than, say, every frame
// the game loop will do this for us automatically
int pos;
assert(GameConfiguration->CapsSound.MaxSounds<255);
75 
if(GameConfiguration->CapsActualSystem.UseSound) 
{
  //loop through array
  for(int i=0;i<GameConfiguration->CapsSound.MaxSounds;i++) 
  {
    //if it contains a voice get its position
    if(VoiceArray<i>!=-1) pos=voice_get_position(VoiceArray<i>); else pos=-2;
83 
    //if it is at the end then release it
    if(pos==-1 || (killit==true && pos!=-2)) 
    {
      deallocate_voice(VoiceArray<i>);
      VoiceArray<i>=-1;
    }
  }
}
92}
93 
94void Framework::SoundKillDigi()
95{
//stop all samples in their tracks and clear the play buffer
if(GameConfiguration->CapsActualSystem.UseSound) 
{
  //loop through array
  for(int i=0;i<GameConfiguration->CapsSound.MaxSounds;i++) 
  {
    //if it contains a voice get its position
    if(VoiceArray<i>!=-1) deallocate_voice(VoiceArray<i>);
    VoiceArray<i>=-1;
  }
}
107}
108 
109int Framework::SoundDigiPos(int voice)
110{
if(GameConfiguration->CapsActualSystem.UseSound && voice>=0) return voice_get_position(voice);
else return -1;
113}

Neil.
MAME Cabinet Blog / AXL LIBRARY (a games framework) / AXL Documentation and Tutorial

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